import java.util.Random;
import java.util.ArrayList;
public class Suduku {
  /**
   *打印二維數(shù)組，數(shù)獨矩陣
   */
  public static void printArray(int a[][])
  {
    for (int i = 0; i < 9; i++) {
      for (int j = 0; j < 9; j++) {
        System.out.print(" "+a[i][j]);
        if (0==((j+1)%3)) {
          System.out.print(" ");
        }
      }
      System.out.println();
      if(0==((i+1)%3))
      {
        System.out.println();
      }
    }
  }
  /**
   * 產(chǎn)生一個1-9的不重復長度為9的一維數(shù)組
   */
  public static ArrayList<Integer> creatNineRondomArray()
  {
    ArrayList <Integer>list = new ArrayList<Integer>();
    Random random=new Random();
    for (int i = 0; i < 9; i++) {
      int randomNum=random.nextInt(9)+1;
      while (true) {
        if (!list.contains(randomNum)) {
          list.add(randomNum);
          break;
        }
        randomNum=random.nextInt(9)+1;
      }
    }
    System.out.println("生成的一位數(shù)組為：");
    for (Integer integer : list) {
      System.out.print(" "+integer.toString());
    }
    System.out.println();
    return list;
  }
  /**
   *通過一維數(shù)組和原數(shù)組生成隨機的數(shù)獨矩陣
   *
   *遍歷二維數(shù)組里的數(shù)據(jù)，在一維數(shù)組找到當前值的位置，并把一維數(shù)組
   *當前位置加一處位置的值賦到當前二維數(shù)組中。目的就是將一維數(shù)組為
   *依據(jù)，按照隨機產(chǎn)生的順序，將這個9個數(shù)據(jù)進行循環(huán)交換，生成一個隨
   *機的數(shù)獨矩陣。
   *
   */
  public static void creatSudokuArray(int[][]seedArray,ArrayList<Integer> randomList)
  {
    for (int i = 0; i < 9; i++) {
      for (int j = 0; j < 9; j++) {
        for (int k = 0; k < 9; k++) {
          if(seedArray[i][j]==randomList.get(k))
          {
            seedArray[i][j]=randomList.get((k+1)%9);
            break;
          }
        }
      }
    }
    System.out.println("處理后的數(shù)組");
    Suduku.printArray(seedArray);
  }
  public static void creatSudokuQuestion(int [][] a)
  {
    Random rand=new Random();
    for(int i=0;i<9;i++){
      for(int j=0;j<4;j++){
      a[i][(int)rand.nextInt(9)]=0;
      }
    }
    Suduku.printArray(a);
  }
  //
  public static void main(String[] args) {
    int seedArray[][]={
        {9,7,8,3,1,2,6,4,5},
        {3,1,2,6,4,5,9,7,8},
        {6,4,5,9,7,8,3,1,2},
        {7,8,9,1,2,3,4,5,6},
        {1,2,3,4,5,6,7,8,9},
        {4,5,6,7,8,9,1,2,3},
        {8,9,7,2,3,1,5,6,4},
        {2,3,1,5,6,4,8,9,7},
        {5,6,4,8,9,7,2,3,1}
    };
    System.out.println("原始的二維數(shù)組:");
    Suduku.printArray(seedArray);
    ArrayList<Integer> randomList=Suduku.creatNineRondomArray();
    Suduku.creatSudokuArray(seedArray, randomList);
    System.out.println("生成數(shù)獨問題:");
    Suduku.creatSudokuQuestion(seedArray);
  }
}

原始的二維數(shù)組:
 9 7 8 3 1 2 6 4 5 
 3 1 2 6 4 5 9 7 8 
 6 4 5 9 7 8 3 1 2 

 7 8 9 1 2 3 4 5 6 
 1 2 3 4 5 6 7 8 9 
 4 5 6 7 8 9 1 2 3 

 8 9 7 2 3 1 5 6 4 
 2 3 1 5 6 4 8 9 7 
 5 6 4 8 9 7 2 3 1 

生成的一位數(shù)組為：
 2 3 9 1 6 8 7 5 4
處理后的數(shù)組
 1 5 7 9 6 3 8 2 4 
 9 6 3 8 2 4 1 5 7 
 8 2 4 1 5 7 9 6 3 

 5 7 1 6 3 9 2 4 8 
 6 3 9 2 4 8 5 7 1 
 2 4 8 5 7 1 6 3 9 

 7 1 5 3 9 6 4 8 2 
 3 9 6 4 8 2 7 1 5 
 4 8 2 7 1 5 3 9 6 

生成數(shù)獨問題:
 0 5 7 9 6 3 0 0 0 
 9 6 3 0 0 0 0 5 7 
 0 2 4 1 0 7 9 6 0 

 5 0 1 6 0 9 2 0 0 
 6 0 9 2 0 0 5 7 0 
 2 0 8 0 7 1 0 3 9 

 7 1 5 0 0 6 4 8 2 
 3 0 6 4 8 2 7 0 5 
 4 8 2 7 0 0 3 9 6